Cutter head



' y 1931; H. s. WALTHERS i 1,807,185 I CUTTER HEAD v Filed July v22,1923 Y 171mm? flaw/:95 Wale/bye: By A ga -Q9,

Patented May 26, 1931 UNE'TED STATES tartar" OFFlCE HARRY S. WALTEERS,OF BELOIT, WISCONSIN, ASSIGNOR TO YATESAMERICAN MA- CHINE COMPANY, OFBELOIT, WISCONSIN, A CORPORATION OF DELAWARE CUTTER HEAD Application.filed July 22,

This invention is concerned with cutter heads of the type designed toreceive a plurality of knife carriers, and has for its object theprovision of a novel cutter head assembly which is extremely simple,compact, rigid, durable, and inexpensive to manufacture.

While the foregoing statement is indicative in a general way of thenature of the invention, other more specific objects and ad- 1 vantageswill be apparent upon a full un: derstanding of the structural featuresof the various parts of the improved assembly.

One fornf of the invention is presented herein for the purpose ofexemplification but it will of course be appreciated that the inventionis susceptible of embodiment in other modified structural forms comingequally within the scope of the appended claims.

In the accompanying drawings:

Fig. 1 is an end View of a cutter head and knife carrier assemblyconstructed in accordance with the invention; and

Fig. 2 is a face view of the assembly, with portions broken away toillustrate more clearly the interior construction.

As will be observed in the drawings, the assembly includes a one-piececutter head 10 which has a cylindrical bore 11 and a cylindrical outerface 12 through which T-shaped slots 13 are cut transversely at regularin tervals. The head 10 is adapted to receive a plurality of knifecarriers 14 which have concave inner faces 15 which are adapted to fitsnugly against the cylindrical face 12 of the head and transverse ribs16 intermediate the front and rear edges, of the concave faces 15 whichare adapted to fit within the narrow outer portions 17 of the slots 13.The carriers 14 are provided with apertures 18 at the locations of theribs, and bolts 19 are adapted to extend through the apertures andengage with nuts 20 on the outer faces of the carriers, with the heads21 of the bolts within the wide inner portions 22 of the slots 13 ininterlocked engagement with the shoulders 23 formed at the sides of theslots. The outer faces of the carriers are preferably fiat and arenormal to the curvature of the inner faces at the locations of thetransverse ribs, thereby resulting in proportionately thick 1929. SerialNo. 379,961.

and consequently strong heels on the carriers while at the same timematerially reducing the peripheral weight in the head when fullyassembled. Y

The curvatureof the inn-er faces 15 of the carriers is preferably on aslightly shorter radius than the curvature of the outer face 12 of thehead, in order to cause the carriers to bear against the head along thefront and rear edges only. The interlocking associa tion of the ribs 16with the sides of the outer portions 17 of the slots 13 prevents anycanting of the carriers, while the clamping action of the bolts 19 andcarrier-securing nuts 20 effectively precludes any axial displacement ofthe carriers.

The cutter head of the invention, by reason of its simple and compactform, is easy to manufacture, requires but a few operations in itsformation, is exceedingly strong and permits of secure attachment of thecarriers with the attaching means subject only to radially appliedstresses. The slight difference between the degrees of curvature of theopposed faces of the head and carriers insures a snug fit even though asmall amount of foreign matter is present on such surfaces.

Knives of any description may be attached to outwardly projectingflanges 2 1 on the carriers, which flanges may be apertured at 25 forthe reception of attaching bolts.

1 claim:

1. A cylindrical cutter head having transverse T slots therein, aplurality of inwardly concave knife carriers of slightly less radiusthan the head having transverse ribs thereon for arrangement about thehead in snug complementary interfitting relation thereto with the ribspositioned in the outer narrow portions of the slots, and headed boltsin the wide portions of the slots projecting outwardly through aperturesin the ribs for holding the carriers against radial displacement.

2. A cylindrical cutter head having trans verse T slots therein, aplurality of inwardly concave and outwardly flat knife carriers havingtransverse ribs on the inner concave faces thereof, said carriers beingof progressively increasing thickness from the ribs rearwardly towardthe heels thereof and being arranged about the head in snugcomplementary interfitting relation thereto with the ribs positioned inthe outer narrow portions of the slots, headed bolts in the Wideportions of the slots projecting outwardly through apertures in theribs, and nuts mounted'on the outer ends of the bolts in engagement withthe outer flat faces of the carriers for holding the latter againstradial displacement.

3. A knifec-arrier for application to a cylindrical transversely slottedcutter head, characterized by a concave inner face for complementaryengagement with the outer face of the head and a substantially flatouter face for engagement with suitable holding means, and a transverserib on the-curved inner face of the carrier intermediate the front andrear portions thereof for interfitting association with one of the slotsin the outer face of the head, said carrier being of progressivelyincreasing thickness from the rib toward the rear portion of thecarrier.

In witness whereof I have hereunto subscribed my name.

' HARRY S. WALTHERS.

